Phonograph reproducer



G-L'B. BURCH. PHONOGRAPH REPRODFJCEB. APPLICATION FILED APR. 3,191.8- RENEWED AUG. 2,192]- lfill fifi m Patented May 2, 1922,

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PHONOGRAPH REPBODUCER. APPLICATION FILED APR. s, 1918. RENEWED AUG. 2. 1921.

lfilfififin I Patented May2, 1922a 5 vwewto z unit 1 rates arena GEORGE 3B. BURCH, 015 NEW YORK, N. Y., ASSIGTVOR T LESLIE STEVENS, 0F GLEN.

' RIDGE, NEW JERSEY.

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Specification of Letters Patent.

Patented May 2,1922.

Application filed April 3, 1918, Serial No. 226,382 Renewed August 2, 1921. Serial No. 489399;

To all whom it may concern:

Be it known that I, GEORGE B. BURCH,

a citizen of the United States, and a resident of the city of New. York, county of Kings, and State of New York, have invented new and useful Improvements in Phonograph are accomplished by my invention, one, em-

Reproducers, of which the following is a bodiment of which is hereinafter more particularly set forth.

For a more particular description of my invention, reference is to be had to the acc'ompanying drawing, forming-a part hereof, in which- Q Fig. 1 is a sectional view of a phonograph having a reproducer embodying my invention.

Fig. 2 is an enlarged sectional view of a portion of the diaphragm, stylus holder, transmission rod and connected parts.

Fig. 3 is a sectional view, taken on the line 3 3 of Fig. 2, looking in the direction of the arrows. V

Fig. 4 is a plan View of a disk, which supports one end of the transmission rod.

Throughout the various views of the drawings, similar reference characters designate similar parts.

The drawings show a phonograph 1 provided with a suitable casing 2, in which is contained a motor 3, of any suitable kind. Rising from this motor is a vertically disposed shaft 4 on which a'rotating turntable 5 is mounted in the conventional manner, and this table supports a record 6. A bracket 7 adjacent to the turntable 5 and at one side thereof carries a swivel pin 8 which turns freely therein, and at the top of this pin is a hinge 9 connected to rings 10, which have a diaphragm 11 fixed between them. In the preferred embodiment of my inven-- tion, this diaphragm is made large, thatis about a foot in diameter, but ma be more or less, as desired, and may be thickened at its. center by being made of several layers, or otherwise,and is convex in form when viewed from its upper surface, and concave when viewed from its lower, being most desirably of convex-conoidal form, as shown, and having a gutter or trough 12 adjacent its edge between the main portion of the diaphragm and an edge flange by which it is secured to the supporting rings 10. Sound vibrations transmitted to the center of this diaphragm set the diaphragm in vibration,

amplifying horn, or similar device, is required.

The rings 10 are connected by screws 13 V and washers 14 to a spider 15 which holds a tube 16, and in this tube are mounted various parts, one of which is a transmission rod 17 which has its upper end firmly fixed to the diaphragm 11, at the center of the dia- 1 phragm, and near its lower end it is horizontally disposed, as shown at 18, in Fig. 2, then bent abruptly so as not to touch the cylinder 16, and then it runs straight, but

diagonally, up to a point near the top of the T tube 16, and from thence it is again bent slightly so as to run in and about the axis of the diaphragm to which it is secured; Beyond the part 18, and at the lower end of this transmission rod, it is screw-threaded and made to run in and about the axis above referred to, or substantially this axis, and it is held in place by means of the perforated disk 19 which is shown in Fig. 4:. This disk 19 is fixed in the lower end of the tube 16 between the nuts 20 and 21, as shown in Fig. 2.

- The transmission rod 17 extends through a central perforation in the disk 19 and is secured to the disk by a nut 22 on the inner side of the disk and the needle, or. stylus, holder-23 on the other side of the disk. The stylus holder 23 carries a needle, or stylus, 24, which is secured by a set screw 25, in the conventional manner.

The disk 19 is of'peculiar construction, and its thickness will vary from twelve to twenty-five thousandths of an inch according to the diameter of the rod 17 the thicker the rod the thicker the disk, The disk may be made in several forms, but the preferred form is shown Where there is a foration 26 which is surrounded shoe opening 27, substantially as shown, and the neck 28. The width of this neck 28 is important, because it should be proportionate to the diameter of the rod 17, so that this rod will have a free vibration, but not too free,.when the apparatus is in use. The relative positions of the neck 28 and the part 18 of the transmission rod 17 must be as shown. hen a record having a lateral cut groove is used these parts must be placed in a plane at right angles to the direction of this groove. If the groove be one of varying depth, these parts are placed at right "angles to the position just described.

lln view of the foregoing, theoperation of my improved phonograph will be readily understood. Assuming that the machine is in operation in the conventional manner, and the stylus 24: rests on'a suitable record 6, Which may be one with a lateral cut groove or one with a vertical cut groove, according to the nature of the disk, all disks being the same to this instrument without regard to the nature of the thread, in any event, the sound vibrations are gathered by the stylus 2d and transmitted through the stylus holder 23 to the transmission rod 17 and amplified by the bent laterally disposed portion 18 of this red, with the result that a very perfect transmission to the diaphragm of all the sound vibrations, regardless of nature or character, is obtained, and a loud, clear and very perfect reproduction results. The exact form here shown of lateral extension 18 is not essential, although desirable, as this form may be any of several angles, all of which produce the desired result. The point is that, While the transmission rod because of its being relatively very long and very slender is quite flexible, its short laterally bent portion adjacent the stylus holder will be suiiiciently rigid so that, because of the rigidity of this laterally bent central per by a horsepart and the flexibility of the main part of the rod, vibrations of the stylus holder will be transmitted to the diaphragm in the direction of the length of the rod. The use of pivot pin connections with the possibility of lostmotion is thus avoided and the resulting transmission of vibrations in the direction of the length of the connection between the stylus holder and the diaphragm is the same as though the connection were to arigid part of the stylus holder ofi'set laterally from its pivotal axis. Tn the preferred embodiment of my invention this oil'- set party 18 is over the neck 28, as shown in Figs. 2 and 3.

lV-hile T have shown and described one embodiment of my invention, it is obvious that it is not restricted thereto, but is broad enough to cover all I structures that come within the; scope of the annexedclaims.

Having thus described my invention, what ll claim is:

1. In a phonograph reproducer, the combination with a diaphragm, and supporting means therefor, of a stylus holder mounted axially of the diaphragm and at a distance therefrom and capable of vibratory oscillation, and a long flexible transmission rod rigidly connected to the stylus holder and to the diaphragm and having a lateral. bend adjacent the stylus holder. 1

2. In a phonograph reproducer, the combination with a diaphragm, and supporting means therefor, of a stylus holder mounted axially ofthe diaphragm and at a distance therefrom, the stylus holder being carried by a perforated thin disk peripherally supported from said supporting means in a plane transverse to the axis of the dia-- phragm and having a horseshoe opening extending about its central supported portion, and a transmission connection extending from the stylus holder to the diaphra GEQTRGJE B. BURGH. 

